Kinematograph and like instrument.



, E. A. IVATTS. KINEMATOGRAPH AND LIKE INSTRUMENT.

APPLIOATION FILED NOV. 8, 1907.

Patented Nov. 2, 1909.

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following is a specification.

UNITED STATES PATENT orrron ERNEST ALBERT IVATTS, or PARIS, FRANCE, ASSIGNOR T0 GOMPAGNIE GENE-BALE DE PHONOGRAPHES CINEMATOGRAPHES ET .APPAREILS DE PRECISION 0F PARIS, v

FRANCE.

- KINEMATOGRAPH AND LIKE INSTRUMENT. a

Patented Nov. 2,1909.

Application filed November 8,1907. Serial No. 401,228.

To all whom it my concern.- 7

Be it known that I, Enrws'r ALBERT IvATTs, citizen of Great Britain, residing at: Paris, in the'Departinentpf the Seine, Republic of- France, have invented new and useful Improvements in and Relating to Kinematographs and Like Instruments, of'which the The present invention has for its object a special arrangement for the centering of the band and its application to apparatus used in the kinematographic industry.

With the usual apparatus the band carrying the pictures runs in a groovewhich is primarily intended for the lateral guidance of the band, and so'by this means to decrease the vibrations of the pictures. Theoretically the groove should be very close in width' to that of the band, but in practice, the bands at present used vary considerably invwidth audit is necessary to'give the'groove a'width sultis. that the latter is often free to move sidewise, the extent of the movement being, it is true, small, but, on account of the enlargement by optical projection this produces very large movements of the projected picture. 1

The arrangement forming the subject of i this invention has for its object to; obviate the play between the groove-and theband, wh le insuring the perfect coincidence of thelriongitudinal axes. To effect this centering of the band, the mechanical properties of a parallelogram jointed at its four angles are used It is known that in its movements the system always keeps its-sides parallel one to the other, This invention is illustrated in the accompanyingdrawing.

Figure 1 is a front view of a centering apparatus embodying theprinciples of my invention.- Fig. 2 is a perspective view showin the same applied to a kinematograph. t a F) c d be a parallelogram jointed at its four angles a bc d and let e and f be the .centers of the sides a -c and b d; the two longer sides a b and c d will form the edges of a groove of variable width having for its axis the line 6 f. This axis is made immovable by fixing the short sides a c and b d by their centers to the base of the instrument by means of suitable axes e f; a spring 9 suitably fitted tends to constantly bring to- .gether the two sides a b and 0d and consequently to narrow the groove '5. If a band of variable width. is now imagined moving in the groove thus formed it will be 'seen that the middle 'axis of this will coincide perfectlyat all times with the fixed axis 0- f of the groove, and furthermore all side play will be overcome by the-action of the spring "g. This arrangement may also be applied to the perforating apparatusfor. the bands as well as to the kinematographic apparatus properly so-called producing the analysis or the' synthesis of the movement, and in general to all apparatus utilized in the klnemato- N i v graphic industry and necessitating the exact suiiicient to avoid catching the band the re-,

running of one or more bands. I

Having now described this invention what ent is v I A frame for guiding the movablefilm or band'of'akinematograph in properly centered relation, comprising a Jointed structure of parallelogram formation having two of its opposite sides pivoted at their center to a fixed support, and a tensile spring attached at one corner of the parallelogram deflecting said pivoted sides of the structure toward a more acute angle with the length of said film or band, whereby the other two sides of the parallelogram are caused to contact with both edges of the film or band and maintainithe same constantly centered, regardless of a varying width.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses;

ERNEST ALBERT IVATTS.

Witnesses:

HENRY DANTER, Locum CRESPIN.

;'70 I claim and desire to secure by Letters Pat 

